diff --git a/openair1/SIMULATION/TOOLS/multipath_tv_channel.c b/openair1/SIMULATION/TOOLS/multipath_tv_channel.c index c68ce737580b6ec7ae36763e6138adebbb3f82ce..ece1f81335f4af9393b4a4df37cf08b10918d618 100644 --- a/openair1/SIMULATION/TOOLS/multipath_tv_channel.c +++ b/openair1/SIMULATION/TOOLS/multipath_tv_channel.c @@ -40,9 +40,9 @@ void multipath_tv_channel(channel_desc_t *desc, uint8_t keep_channel) { - double complex **tx,**rx,***H_t,*rx_temp;//, *tv_H_t; + double complex **tx,**rx,***H_t; double path_loss = pow(10,desc->path_loss_dB/20); - int i,j,k,dd; + int i,j,dd; dd = abs(desc->channel_offset); #ifdef DEBUG_CH printf("[TV CHANNEL] keep = %d : path_loss = %g (%f), nb_rx %d, nb_tx %d, dd %d, len %d max_doppler %g\n",keep_channel,path_loss,desc->path_loss_dB,desc->nb_rx,desc->nb_tx,dd,desc->channel_length, @@ -51,8 +51,6 @@ void multipath_tv_channel(channel_desc_t *desc, tx = (double complex **)malloc(desc->nb_tx*sizeof(double complex *)); rx = (double complex **)malloc(desc->nb_rx*sizeof(double complex *)); H_t= (double complex ***) malloc(desc->nb_tx*desc->nb_rx*sizeof(double complex **)); - // tv_H_t = (double complex *) malloc(length*sizeof(double complex)); - rx_temp= (double complex *) calloc(length,sizeof(double complex)); for(i=0; i<desc->nb_tx; i++) { tx[i] = (double complex *)calloc(length,sizeof(double complex)); @@ -84,11 +82,7 @@ void multipath_tv_channel(channel_desc_t *desc, for(i=0; i<desc->nb_rx; i++) { for(j=0; j<desc->nb_tx; j++) { - tv_conv(H_t[i+(j*desc->nb_rx)],tx[j],rx_temp,length,desc->nb_taps,dd); - - for(k=0; k<length; k++) { - rx[i][k] += rx_temp[k]; - } + tv_conv(H_t[i+(j*desc->nb_rx)],tx[j],rx[i],length,desc->nb_taps,dd); } } @@ -99,10 +93,6 @@ void multipath_tv_channel(channel_desc_t *desc, } } - /* for(k=0;k<length;k++) { - tv_H_t[k] = H_t[0][k][0]; - }*/ - for(i=0; i<desc->nb_tx; i++) { free(tx[i]); } @@ -124,7 +114,6 @@ void multipath_tv_channel(channel_desc_t *desc, } free(H_t); - free(rx_temp); } //TODO: make phi_rad a parameter of this function @@ -177,7 +166,7 @@ void tv_channel(channel_desc_t *desc,double complex ***H,uint32_t length){ H[i+(j*desc->nb_rx)][k][l] += sqrt(desc->amps[k])*alpha[p]*cexp(I*(2*pi*w_Hz[i+(j*desc->nb_rx)][k][p]*l*(1/(desc->sampling_rate*1e6))+phi_rad[i+(j*desc->nb_rx)][k][p])); } } - //printf("H[tx%d][rx%d][k%d] = %f+j%f \n",j,i,k,creal(H[i+(j*desc->nb_rx)][k][0]),cimag(H[i+(j*desc->nb_rx)][k][0])); + //printf("H[tx%d][rx%d][k%d][l%d] = %f+j%f \n",j,i,k,0,creal(H[i+(j*desc->nb_rx)][k][0]),cimag(H[i+(j*desc->nb_rx)][k][0])); } } } @@ -201,14 +190,12 @@ void tv_channel(channel_desc_t *desc,double complex ***H,uint32_t length){ } // time varying convolution -void tv_conv(double complex **h, double complex *x, double complex *y, uint32_t nb_samples, uint8_t nb_taps, int dd){ - - int i,j; - - for(i=0; i<((int)nb_samples-dd); i++) { - for(j=0; j<nb_taps; j++) { - if(i>j) - y[i+dd] += creal(h[j][i])*creal(x[i-j])-cimag(h[j][i])*cimag(x[i-j]) + I*(creal(h[j][i])*cimag(x[i-j])+cimag(h[j][i])*creal(x[i-j])); +void tv_conv(double complex **h, double complex *x, double complex *y, uint32_t nb_samples, uint8_t nb_taps, int dd) +{ + for(int i = 0; i < ((int)nb_samples-dd); i++) { + for(int j = 0; j < nb_taps; j++) { + if(i >= j) + y[i+dd] += h[j][i] * x[i-j]; } } }